Warp-stop mechanism for looms



Magch 18, 1930. c, D BROWN 1,751,304

WARP STOP MECHANISM FOR LOOMS i Original Filed Feb. 14, 1928 2 Sheets-Sheet l /NVEN7"OR ATTORNEY March 18, 1930.

C. D. BROWN Original Filed Feb. 14, 1928 2 Sheets-Sheet 2 ATTORNEY Patented Mar. 18, 1930 UNITED a f I 1,751,304

FFHCE CARL ID. BROWN, OF HOPEDALE, MASSACHUSETTS, ASSIGNOR 'I'O D'RAPER CORPORA- TION, OF HOPEDALE, MASSACHUSETTS, A' CORPORATION OF MAINE.

I WARP-STOP MECHANISM r011 LOOMS Original application filed February 14, 1928, Serial No. 254,201, Divided and thisapplieation filed May 22, 1929. Serial No. 365,068.

This invention relates to warp stop mechanism for looms and is more particularly directed to drop wire assembling means.

Warp stop mechanisms now usually comprise a series of drop wires which are nor mally supported by the warp threads during weaving, and each drop wire is provided with an elongated slot through which is passed a bar to guide the drop wires in their movements. In that type of warp stop mechanism wherein the detecting element is constituted as a transversely movable toothed detector bar, it is now the usual practice to string the drop wires upon the toothed detector bar, with the result that should a warp thread break or become too slack for weaving purposes, the associated drop wire will engage the toothed detector bar and arrest its movement to effect loom stoppage.

In assembling the drop wires with the warp threads and the detector bars itis essential that each drop wire shall be supported by a warp thread and that the detector bars shall be passed through the elongated slots formed in the drop wires, and one of the objects of the present invention is to provide a drop wire assembling device which shall be simple in construction and yet serve effectively to permit stringing of the drop wires upon the warp threads and alining the drop wires for' the lengthwise insertion of thedetector bars, and in these respects the present application is a division of a prior application by Carl D. Brown, Serial No. 254,201, filed February 14, 1928, entitled Warp stop mechanism for looms now Patent No. 1,718,918, dated June 25, 1929.

The invention and novel features thereof will best be made clear from the following description and the accompanying drawings of one good form thereof.

In the drawings:

Fig. 1'is' a fore and aft section through a warplstop mechanism containing the present invention; and

Fig. 2 is a perspective view of one side of the warp stop mechanism, showing more particularly the drop wire assembling means.

As is usual with warp stop mechanism of the transversely movable detector bar type, a

bracket is secured at each side of the loom for supporting the warp stop mechanism, and since these brackets or supports may be of'the same general construction, only one is shown and described,

Mounted at each side of the loom is a side member orsupport 1 which may be sustained in any appropriate manner upon the loom frame, and extending between the side members or supports 1 arethe toothed detector bars which pass through elongated slots 3 in the drop wires 4 which are themselves normally supported by the warp threads at, as indicated in Fig. 1.

The detector bars, in the present instance of the invention, each comprise a fixed member 5' and a transversely movable toothed member 6 which are supported in suitable sockets or openings 7 formed in the side supports 1, and, as usual in this type of warp stop mechanism, the movable detector bar is associated with means for imparting longitudinal movement thereto, but since the details of such mechanism constitute no essential part of the present invention, they are not herein shown and described.

Extending between the side supports 1 are the warp rests 8 on which the warp threads a normally rest during weaving, and each of the side supports is provided with an elongatedslot or opening 9 in which may be supported additional warp supports or division plates,if desired.

The drop wires in the present instance of the invention are shown as of the hair pin type, each of which has two leg portions 10 which facilitate the assembly of the drop wires on the warp threads, although in this respect the drop wires may be otherwise contrived. In the illustrated form of drop wires, the warp threads a pass individuallybetween the leg portions 10 and serve to maintain the drop wires in normally raised position during weaving, the construction being such that should'a warp thread break or become too slack for weaving purposes, the associated drop wire will fall, as indicated by one of the drop wires in Fig.1, and its upper portion will engage between the teeth of the fixed and movable detector bars, with the result'that the movable detector bar will be arrested to effect loom stoppage. In all these respects the Warp stop mechanism may be substantially the same as that shown and described more fully in the parent application.

, In accordance with the present invention, each of the side supports 1 is provided with a stringer cap which when in operative position for the action of the warp stop mechanism, overlies the detector-bars and maintains them in their operative position on theside supports, and when moved into drop wire assembling position serves to support stringer bars on which the drop wires may be assembled and by which the elongated slots in the drop wires may bebrought into alinement for the endwise insertion of the toothed detector bars.

Each of the side supports is provided with a pivoted bolt 11 which may 'beconveniently mounted on a pivot'12 formed in a recess in the side support 1, as clearly indicated in Fig. 1. The bolt 11'has threaded thereon the cap nut 13 whereby when thestringer cap is in normal position, as indicated inFig. 1, the

end portion thereof will be held in operative position. In the present instance, the stringer cap 1 1 is provided with a recess 15 in itsend for the reception of the bolt 11 when swung into its upper or operative position.

Extending from one end of each side support 1 are the lugs 16 through which extends a pin 17 mounted in thelugs for rocking movement;

Each stringer caphas a downwardly extending portion 18 at the end opposite the bolt 11, which is provided with a slot 19 through which the rocking pin 17 passes.

Threaded into the rocking pin 17' is abolt 20, the top portion of which is provided with a head 21, by which the bolt may be turned for a purpose that will presently appear, and interposed between the head 21 and the top surface of the stringer cap are the locking washers 22.

From the construction thus'far described it will be apparent that upon loosening the bolt 11 by manipulation of the nut 13, the stringer caps/may be swung about their pivotal support 17 in the direction of the warp threads from their operative to'their drop wire as semblingposition, asindicated in Fig. 2.

' Each of the stringer caps is adapted for the support of one or more stringer bars on which the drop wires may be assembled with the warp threads and have their elongated slots aimed for the introduction of the toothed de-' tector bars. In the present instance of the invention, each stringer capis provided with sockets 23 in which the end portions of the stringer bars 24 may rest during drop wire assembly. The stringer bars 24 extend betweenthe stringerfcaps at opposite sides of the warp stop mechanism, and are of dimens'ion's to engage between the leg portions openings 8 of the drop wires for the length wise introduction of the toothed detector bars,

as indicated in Fig. 2.

When the'stringer capsare swung in the direction of the warp threads into their drop wire assembling positions, it is desirable that they should be substantially horizontal and parallel, and to this end each of the side sup-' ports 1 is provided with a surface 26 constituting a stopfor engagement with theend portion 27 of the'associated stringer cap, as indicated in Fig. 2.. i

The warp threadson which the drop wires are to be assembled may not always be in the same vertical position, a'condition which may 7 vary in different looms, or some parts of the loom itself may interefere with the stringer caps when they areswung into'their assembling position, and to meet these conditions the present invention providesthat when the stringer caps are swung into their assembly position, as indicated in Fig; 2, they may be raised or lowered while still maintaining their substantially horizontal and parallel rela tion. This variation in the vertical position of the stringer caps when they are in assembling position may be'readily accom plished by means of the screws 20- which, as hereinbefore described,are threaded into the rocking pinl'? carried in the bearing'portion 16 of the side supports; For instance, in Fig. 2, the stringer cap is shown in its raised position, which has been accomplished by manipulation of the screw 20 on the head 21 of which the stringer cap, of course, rests. Similarly, 7

should conditions require that the stringer cap be lowered, it may be accomplishedreadily by manipulation of the screw 20:

From the construction described it will be apparent that when the stringer caps'are in their operative position, as indicated inFig.

1, they maintainthe toothed detector bars seated properly upon the side supports, and when it is desired to assemblethe drop wires with a new warp, the stringer caps may be swung about their support 17 in the direction of the warp threads int-o substantially horizontaland parallel relation, and may be raised or lowered in accordance with'the conditions either of the warp or loom parts; WVhen the drop wires have been assembled on a stringerbar, as indicated in Fig. 2, the elongated slots are alined for the introduc tion of the detector bars, and then on the completion of a row of drop wire assembling;

such row of drop wires may be transferred by the toothed detector bars into their'operative position between the side supports.

In order that the assembled drop wires and" toothed detector bars may not have to be raised an undue amount in transferring them from their assembling to their operative position, the stringer bars 24 are made flexible so that by slightly bending such bars they may be moved from their supports 23 on the stringer caps and lowered from their assembling position.

What is claimed is:

1. In a warp stop mechanism for looms, the combination of side supports, a series of drop wires having elongated slots, a stringer cap pivotally connected to each side support to swing lengthwise of the warp and provided with stringer bar supports, and a stringer bar adapted to be supported by the stringer caps when they are swung to assembly position relative to the side supports that the drop wires may be assembled on the warp thread and have the drop wire slots alined for the endwise introduction of an elongated bar.

2. In a warp stop mechanism for looms, the combination of side supports, a series of drop wires having elongated slots, a stringer cap pivotally connected to each side support to swing lengthwise of the warp and provided with stringer bar supports, stops for limiting the swinging movement of the stringer caps into substantially horizontal and parallel positions, and a stringer bar adapted to be supported by the stringer caps when they are swung to assembly position relative to the side supports that the drop wires may be assembled on the warp thread and have the drop wire slots alined for the endwise introduction of an elongated bar.

3. In a warp stop mechanism for looms, the combination of side supports secured, one at each side of the loom, a series of drop wires having elongated slots, a stringer cap pivotally connected to each side support to swing lengthwise of the warp and provided with stringer bar supports, means for adjusting the stringer caps in a substantially vertical direction when swung tohorizontal assembly position, and a stringer bar adapted to be supported between the two stringer caps when they are swung to assembly position on the side supports that the drop wires may be assembled on the warp in alined position for the endwise introduction of a detector bar through the alined slots of the drop wires.

4. In a warp stop mechanism for looms, the combination of side supports, a series of drop wires having elongated slots, a stringer cap pivotally connected to each side support to swing lengthwise of the warp and provided with stringer bar supports, means for adjusting the pivotal axis of the stringer caps when they are swung to assembly position to accord with the height of the warp threads and position the stringer caps in parallel relation in the same horizontal plane, and a stringer bar adapted to be supported between the two stringer caps when they are swung to assemply position on the side supports that the drop wires may be assembled in alined position on the warp threads.

5. In a warp stop mechanism for looms, the combination of side supports, a series of drop wires having elongated slots, a stringer cap pivotally connected to each side support to swing lengthwise of the warp, stops for limiting the swinging movement of the stringer caps into substantially horizontal and parallel positions, means for adjusting the height of the stringer caps to correspond to the height of the warp while the stops maintain the stringer caps in substantially horizontal position, and a stringer bar adapted to be supported between the stringer caps when they are swung to assembly position that the drop wires may be assembled in alined position on the warp threads.

6. In a warp stop mechanism for looms, the combination of side supports, a series of drop wires having elongated slots, a toothed detector bar for endwise insertion through the slots of the drop wires, a stringer cap pivotally mounted on each side support for swinging movement into assembly position lengthwise of the warp, means for vertically adjusting the pivotal connection of the stringer caps with the side supports when the stringer caps are swung to assembly position, stops for maintaining the stringer caps in substantially horizontal position as they are vertically adjusted, and a stringer bar adapted to be supported by the stringer caps when they are swung to assembly position that the drop wires may be assembled on the warp threads in alined position for the introduction of the toothed detector bar.

7 In a warp stop mechanism for looms, the combination of side supports, a stringer cap for each side support and connections between the side support and stringer cap, comprising a pin mounted on the support, a lug extending from the end of the stringer cap and having an elongated slot embracing the pin, and a bolt carried by the stringer cap and threaded in said pin for raising or lowering the stringer cap when it is turned into drop wire assembling position.

In testimony whereof, I have signed my name to this specification.

CARL D. BROWN. 

